This code prepares the spatial data for the Gulf of California region. For the equal area projections, I will use Albers Equal Area EPSG:5070
Area of the GoC: 179,938 km2 (177,000 km2 according to Wikipedia)
STEP 1 Obtain high resolution polygon of Gulf of California region
Open Street Map has the highest resolution coastline data. Data downloaded from here (Dec 18 2024): https://osmdata.openstreetmap.de/data/water-polygons.html
Combined with data from: https://www.marineregions.org/downloads.php to get border data.
STEP 2 Make some decisions